Dr. Jacobs- I have my first US at 6 weeks. However I feel that may be a tad too soon to see a heart beat. I really do not want to get all stressed out and worried if there is no HB. :-\ I am thinking about moving my appt. for 6.5 weeks to avoid the worry. My nurse told me that there is a 50/50 chance on whether a heart beat will be detected or not and that I may have to come back. What is your experience with 6 weeks US's?